Bump! I too would appreciate emoji support for guest correspondence.
If AirBnB doesn't want listing titles to become cluttered with emoji, fine. But there's no reason to disallow them for private messaging.
I have found a few that are not blocked.
These work:
☀️⭐️
I wonder if the emojis that do work are related to early emoji sets.
https://blog.emojipedia.org/correcting-the-record-on-the-first-emoji-set/
Perhaps AirBnB isn't blocking them. Perhaps they just haven't implemented some of the later character sets. (Although any excuses for not doing so would be poor. It's trivial. )
While we wait for full support, I'd love to have a full list of the subset of emojis which actually work in messaging.
Anyone else want to help compile a full list of supported emojis?